Allen Formation

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Allen Formation
Stratigraphic range: Upper Cretaceous
Type Geological formation
Unit of Malargüe Group
Overlies Anacleto Formation

The Allen Formation is a geological formation in Argentina whose strata date back to the Late Cretaceous (middle Campanian to early Maastrichtian.[1] Dinosaur remains are among the fossils that have been recovered from the formation.[2]

Vertebrate paleofauna[edit]

Dinosaurs[edit]

Dinosaur eggs are known from the formation.[3]

Dinosaurs reported from the Allen Formation
Genus Species Location Stratigraphic position Material Notes Images

Aeolosaurus[3]

Indeterminate[3]

Austroraptor

A. cabazai

Lamarqueavis[4]

L. australis[4]

"Right coracoid with damaged sternal and omal extremities, and lacking acrocoracoidal process."[4]

Lapampasaurus[5]

L. cholinoi[5]

Elements of the axial and appendicular skeleton of a subadult individual.[5]

Laplatasaurus[3]

L. araukanicus[3]

Limenavis[3]

L. patagonica[3]

"Partial forelimb."[6]

Pellegrinisaurus[3]

P. powelli[3]

"Dorsal and caudal vertebrae, partial femur."[7]

Quilmesaurus[3]

Q. curriei[3]

Femur and distal tibia.[8]

Rocasaurus[3]

R. muniozi[3]

"Partial postcranial skeleton."[9]

Saltasaurus[3]

S. robustus[3]

Willinakaqe[10]

W. salitralensis[10]

Pterosaurs[edit]

Fragmentary fossils are known from the formation.[3]

Pterosaurs reported from the Allen Formation
Genus Species Location Stratigraphic position Material Notes Images

Aerotitan[11]

A. sudamericanus[11]

Bajo de Arriagada Uppermost Allen Form. Partial rostrum The first unambiguous azhdarchid from South-America.

Mammals[edit]

The mammal fauna of the Allen Formation is known from seven teeth, which document the presence of several species.[12]

Mammals reported from the Allen Formation
Genus Species Location Stratigraphic position Material Notes Images
Mesungulatum M. lamarquensis Cerro Tortuga Two upper molars and a fragmentary lower molar A dryolestoid
Groebertherium G. stipanicici Cerro Tortuga One upper molar A dryolestoid
Cf. Brandonia sp. Cerro Tortuga One lower molar A dryolestoid
Barberenia B. allenensis Cerro Tortuga One upper molariform A dryolestoid
Trapalcotherium T. matuastensis Cerro Tortuga One first lower molar A gondwanathere

See also[edit]

Footnotes[edit]

  1. ^ Salgado, L., Coria, R. A., Magalheas Ribeiro, C. M., Garrido, A., Rogers, R., Simon, M. E., Arcucci, A. B., Rogers, K. C., Carabajal, A. P., Apesteguia, S., Fernandez, M., Garcia, R. A., and Talevi, M. (2007). Upper Cretaceous dinosaur nesting sites of Rio Negro (Salitral Ojo de Agua and Salinas de Trapalco-Salitral de Santa Rosa), northern Patagonia, Argentina. Cretaceous Research, 28(3):392–404.
  2. ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, South America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 600-604. ISBN 0-520-24209-2.
  3. ^ a b c d e f g h i j k l m n o p "63.10 Provincia de Rio Negro, Argentina; 5. Allen Formation," in Weishampel, et al. (2004). Page 604.
  4. ^ a b c Federico L. Agnolin (2010). "An avian coracoid from the Upper Cretaceous of Patagonia, Argentina". Stvdia Geologica Salmanticensia 46 (2): 99–119. 
  5. ^ a b c Rodolfo A. Coria, Bernardo González Riga and Silvio Casadío (2012). "Un nuevo hadrosáurido (Dinosauria, Ornithopoda) de la Formación Allen, provincia de La Pampa, Argentina". Ameghiniana. in press. 
  6. ^ "Table 11.1," in Weishampel, et al. (2004). Page 215.
  7. ^ "Table 13.1," in Weishampel, et al. (2004). Page 269.
  8. ^ "Table 4.1," in Weishampel, et al. (2004). Page 77.
  9. ^ "Table 13.1," in Weishampel, et al. (2004). Page 270.
  10. ^ a b Rubén D. Juárez Valieri, José A. Haro, Lucas E. Fiorelli and Jorge O. Calvo (2010). "A new hadrosauroid (Dinosauria: Ornithopoda) from the Allen Formation (Late Cretaceous) of Patagonia, Argentina". Revista del Museo Argentino de Ciencias Naturales n.s. 11 (2): 217–231. 
  11. ^ a b Novas, F. E.; Kundrat, M.; Agnolín, F. L.; Ezcurra, M. N. D.; Ahlberg, P. E.; Isasi, M. P.; Arriagada, A.; Chafrat, P. (2012). "A new large pterosaur from the Late Cretaceous of Patagonia". Journal of Vertebrate Paleontology 32 (6): 1447. doi:10.1080/02724634.2012.703979.  edit
  12. ^ Rougier, G.W., Chornogubsky, L., Casadio, S., Paéz Arango, N. and Giallombardo, A. 2009. Mammals from the Allen Formation, Late Cretaceous, Argentina (subscription required). Cretaceous Research 30:223–238.

References[edit]

  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.